She should have atleast 22 #1's, had little mistakes in her career been done correctly. She could have 25+ #1's had they REALLY BEEN THIRSTY, which is insane.
Loverboy - Had Tommy not been bitter and discounted Destiny Child's "Bootylicious" to purposely block "Loverboy" from #1.
Endless Love - Was Luther's single, but had they been greedy could've went from #2 to #1.
Shake It Off - Blocked herself from #1 with WBT. Had this been released after it'd be a #1.
Can't Let Go - Had they been a biT more desperate since they weren't desperate yet it would've gone #1.
"Forever" also went #9 on Hot 100 Airplay, WITHOUT being a single. Had they released it as a Physical Single w/ the usual discount it would've been allowed to chart, and skyrocketed to #1. Same with "Butterfly" which went to #16 on Hot 100 Airplay. "My All" only reached #15 on Hot 100 Airplay, yet still went #1 so those 2 could've been #1's if singles.
You also have to add in the factors that many of her eras during the end were cut early because Tommy was bitter. "All I Want For Christmas" also was #12 on Hot 100 Airplay, but wasn't allowed to chart at the time. Could've also been #1.